For boxes, I use the Cheyenne Cartridge .45 Schofield boxes (since I use Schofields) from Buffalo Arms or Midway. This image is scaled 30% (IIRC) and glued the to box with rubber cement. A thin film on the box, and a thin film on the back of the label. Let them dry, then apply. I have about ten of the boxes, so when I crank them out of the loading press, I just store in the boxes.
For 44-40 boxes, I think it is scale 27%, and 28% for the 45 Colt boxes.